Four sided figures are called quadrilaterals. They are usually squares, rectangles, trapizoids, etc..
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Triangular Pyramid.
Any 4 sided polygon is called a quadrilateral
a 4 sided shape is called a quadrilateral
A 3 sided shape is a triangle. A 4 sided shape could be a square or rectangle.
a 4 sided 3d shape is called a triangular prism!!!!!!!!!!!!!!!